AT&T announced it will offer the 2 GB option of its Mobile Share Value plan for $15 less than before.

AT&T announced it will offer the 2 GB option of its Mobile Share Value plan for $15 less than before. (Ronda Churchill / Bloomberg)

Salvador Rodriguez

Old rivals AT&T and T-Mobile are fighting again to the benefit of their customers.

Dallas-based AT&T over the weekend announced that it will offer customers its 2-gigabyte Mobile Share Value data plan for $15 less than it previously did. At that price, a customer with a single smartphone line can get unlimited talk and text along with the 2 GB of data for $65 per month.

We’re continuing the trend of offering more value to our new and existing customers," said David Christopher, AT&T Mobility chief marketing officer, in a statement.

The recent changes by each of the carriers are the latest shots fired in a spat that's heated up this year. Since January, AT&T and T-Mobile have actively tried to poach each other's customers, and it doesn't look as if the tiff will end any time soon.